CMR can visualize irreversible myocardial injury, even if those lesions affect as little as less than 2 grams of myocardial tissue5. Our own data show that CMR is an accurate tool to diagnose acute myocardial infarcts, when T2-weighted imaging for the detection of acute edema is used in conjunction with imaging for irreversible injury6; we also showed that irreversible myocardial injury can be detected as soon as 1 hour after infarction7.